AST101- December 6, 2011.docx

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Department
Astronomy & Astrophysics
Course
AST101H1
Professor
Michael Reid
Semester
Fall

Description
AST101 LIFE More emphasis in SA (of last section we did)  We know asteroids and comets are able to wipe out life from planets  In 5 billion years the sun will run out of fuel and die  What life on earth has in common: its all based on DNA What is life?  Homeostasis, organization, metabolism, growth, adaptation, response to stimuli, reproduction  get a cell  We don’t really know what constitutes life Where can life live? Why did we form from carbon which is less abundant than silicon?  silicon makes 4 bonds like carbon - we don’t know where it could survive (things made of silicon) so we don’t know where to look, so we look for things tha
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